2020+ Silverado HD & Sierra HD Troubleshooting

490 topics in this forum

1. 2020 duramax truck jolting while towing

   By bryant87, July 12
   • 2 replies
   • 509 views
   • 
   • bryant87
   • 2 hours ago

3. 2020 Sierra 2500 HD Denali No power to trailer lights

   By freekie, 20 hours ago
   • 1 reply
   • 94 views
   • 
   • gemarsh
   • 4 hours ago

4. Brakes Squeaking @ 10K 1 2 3 4 6

   By LarryM, September 16, 2020
   • 81 replies
   • 37.8k views
   • 
   • gemarsh
   • 4 hours ago

5. Trailer Brake Issue

   By marpel, Saturday at 04:14 AM
   • 4 replies
   • 186 views
   • 
   • marpel
   • 20 hours ago

6. Left Rear Turn Signal Failure ‘21 Duramax

   By BAveryP, Monday at 02:55 AM
   • 2 replies
   • 110 views
   • 
   • kylant
   • Yesterday at 02:32 PM

7. 2022 GMC Sierra 3500 HD Diesel - Ticking

   By chevelleusaf, yesterday at 12:51 AM   

   • engine
   • trans
   • (and 5 more)

     Tagged with:

     • engine
     • trans
     • clicking
     • pinging
     • diesel
     • 3500HD
     • GMC
   • 5 replies
   • 138 views
   • 
   • chevelleusaf
   • Yesterday at 02:16 PM

8. Brand new 2022 Sierra 2500 AT4 with bad alignment

   By ForestAT4, Sunday at 10:24 AM
   • 3 replies
   • 180 views
   • 
   • leolkfrm
   • Monday at 01:13 AM

9. Chime wont stop - how to disable??

   By In2racn, March 8, 2020
   • 5 replies
   • 11.3k views
   • 
   • OSUJWBIV
   • Sunday at 01:26 PM

10. 6L90E (gas truck) 2-1 downshift CLUNK 1 2

    By Epsilon Plus, September 3
    • 15 replies
    • 683 views
    • 
    • Blatant
    • Sunday at 03:11 AM

11. Emergency Brake Releasing

    By Crazy Canuck, Saturday at 11:34 AM
    • 0 replies
    • 131 views
    • 
    • Crazy Canuck
    • Saturday at 11:34 AM

12. No audible beep from rear sensors when backing

    By maxum3300, January 31, 2021
    • 2 replies
    • 6.8k views
    • 
    • Crazy Canuck
    • Saturday at 11:24 AM

13. Switch backlighting too dim

    By Brummie99, September 19
    • 5 replies
    • 287 views
    • 
    • 4x4Hank
    • Saturday at 06:26 AM

14. 2022 High Country HD retractable running board issues 1 2 3

    By mtbadbob, July 30
    • 30 replies
    • 1.5k views
    • 
    • mtbadbob
    • Saturday at 04:43 AM

15. Def reset

    By Toops, September 27
    • 0 replies
    • 132 views
    • 
    • Toops
    • September 27

16. 2020 GMC Sierra Denali L5p Cooling Fan Issues

    By JR Branche, September 24
    • 2 replies
    • 161 views
    • 
    • gemarsh
    • September 25

17. Bed plug part number

    By BigDs_DenaliHD, September 19
    • 4 replies
    • 226 views
    • 
    • BigDs_DenaliHD
    • September 25

18. low voltage at trailer plug

    By Henry L, September 23   

    • brakes
    • 0 replies
    • 137 views
    • 
    • Henry L
    • September 23

19. 2021 GMC Sierra 2500 Denali HD Tow Mirror - Issues

    By 2021GMCLP5, September 22
    • 4 replies
    • 196 views
    • 
    • 2021GMCLP5
    • September 23

20. 2020 GMC Sierra 2500HD Error Code P20EE 1 2

    By slimjim7772, September 24, 2019
    • 28 replies
    • 20.1k views
    • 
    • davester
    • September 22

21. A new 2500 I ordered questions.

    By waltman, September 19
    • 11 replies
    • 407 views
    • 
    • garagerog
    • September 21

22. Oil leak with 150 miles? 2022 2500 gas

    By Pryme, August 31
    • 14 replies
    • 767 views
    • 
    • Pryme
    • September 18

23. Radio calibration

    By alonhighcontry, September 15
    • 1 reply
    • 224 views
    • 
    • Texas1836
    • September 17

24. "Pro Trailering" missing from MY-GMC app

    By In2racn, August 29
    • 3 replies
    • 351 views
    • 
    • Crazy Canuck
    • September 13

25. With Keyless Ignition is there an Assessory Polition Like with a key to have Power ON ?

    By Cosmic Charlie, September 12
    • 8 replies
    • 368 views
    • 
    • Crazy Canuck
    • September 13

26. Tailgate spontaneously opening 1 2 3 4 5

    By jsward12, February 26, 2021
    • 66 replies
    • 32.9k views
    • 
    • mtbadbob
    • September 10